On Sat, Aug 25, 2012 at 12:44:19PM -0700, Kevin Cernekee wrote: > When bcm63xx_udc is in EP0_IN_FAKE_STATUS_PHASE, it won't issue any > more setup() callbacks until the 0-byte reply arrives from the gadget > driver. If the host sends a setup request, the callback will be held > off until after the (unused) status reply. This keeps the gadget > driver from getting confused by out-of-sequence events. Okay. Then it works as requested :) > > - What happens if the host is faster than the UDC. SetConfig returns in > > usb-storage with "DELAYED_STATUS". HW Acks this. Could the Host send another > > request before the gadget queues the ep0 request? > > Could you please clarify if this is the sequence of events you are describing: > > 1) Host sends a valid SET_CONFIGURATION request to a mass storage gadget > > 2) Hardware instantly auto-acks the request, completing the status > phase and allowing the host to proceed with another ep0 request > > 3) bcm63xx_udc sends a spoofed SET_CONFIGURATION setup packet to the > gadget driver > > 4) setup() callback returns USB_GADGET_DELAYED_STATUS (0x7fff) but > doesn't queue up a reply > > 5) Host sends another setup packet before > usb_composite_setup_continue() is called to send the 0-byte status > reply exactly > If so, the next steps should look like: > > 6) bcm63xx_udc takes a data IRQ, and sets ep0_req_completed > > 7) bcm63xx_udc stays in EP0_IN_FAKE_STATUS_PHASE until the 0-byte > reply is received from usb_composite_setup_continue() > > 8) usb_composite_setup_continue() eventually sends the 0-byte reply > > 9) bcm63xx_udc returns to EP0_IDLE and notices that ep0_req_completed is now set > > 10) bcm63xx_ep0_do_setup() looks at the new request, and performs the > setup() callback for the new setup request Okay. This sounds good. > 11) Data/status phases are handled as usual Please tell you HW vendor that this auto ack feature is complete non sense unless you already have :) Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
